镶嵌在基质中的纳米粒子的声子干涉共振效应
Phonon-interference resonance effects in nanoparticles embedded in a matrix
摘要：
我们报告了一个明确的声子共振效应源于锗纳米颗粒嵌入在硅矩阵。我们的方法的特点相结合的声子波包方法与原子动力学和有限元方法植根于连续介质理论。我们发现，多模声子共振，所造成的相干晶格波传播通过和周围的纳米粒子的相消干涉，引起急剧和显着的透射率下降，阻止了较低端的频率范围内的声子传输，几乎没有减少其他纳米结构。共振对声子相干长度敏感，即使相干长度大于颗粒直径，波包宽度的有限性也会减弱透射率下降。通过排列多个纳米颗粒，产生集体振动模式，可以进一步加强透射率下降。最后，它表明，这些谐振效应可以显着降低在较低的频率范围内的热导。
英文摘要：
We report an unambiguous phonon resonance effect originating from germanium nanoparticles embedded in silicon matrix. Our approach features the combination of phonon wave-packet method with atomistic dynamics and finite element method rooted in continuum theory. We find that multimodal phonon resonance, caused by destructive interference of coherent lattice waves propagating through and around the nanoparticle, gives rise to sharp and significant transmittance dips, blocking the lower-end frequency range of phonon transport that is hardly diminished by other nanostructures. The resonance is sensitive to the phonon coherent length, where the finiteness of the wave packet width weakens the transmittance dip even when coherent length is longer than the particle diameter. Further strengthening of transmittance dips are possible by arraying multiple nanoparticles that gives rise to the collective vibrational mode. Finally, it is demonstrated that these resonance effects can significantly reduce thermal conductance in the lower-end frequency range.
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